trigram simlarity

from django.contrib.postgres.search import TrigramSimilarity

from parts.models import Part


def trigram_similarity_search(similarity=0.3, search_string=""):
    parts = Part.objects
    parts = parts.annotate(similarity=TrigramSimilarity('name', search_string))
    parts = parts.filter(similarity__gt=similarity).order_by('-similarity')

    return parts